i think that using both append and atomic should be an error. it would
be very hard to append in atomic mode. you would need to copy the file,
append and then rename. i had never thought of doing append in atomic
mode. append was for adding to log files and similar. if the write size
is small enough (less than what syswrite can do) it will be atomic
anyway as kernel writes are not broken up.
just my thoughts,
uri